class LazyBuffer
Defined at line 17 of file ../../src/storage/minfs/lazy_buffer.h
A lazy buffer wraps a buffer with a lazy reader so that blocks in the buffer can be lazily
read.
Public Methods
zx::result<std::unique_ptr<LazyBuffer>> Create (Bcache * bcache, const char * name, uint32_t block_size)Create an instance of LazyBuffer.
Defined at line 9 of file ../../src/storage/minfs/lazy_buffer.cc
void Shrink (size_t block_count)Shrink the buffer. Does nothing if buffer is smaller.
Defined at line 18 of file ../../src/storage/minfs/lazy_buffer.cc
void LazyBuffer (const LazyBuffer & )Defined at line 34 of file ../../src/storage/minfs/lazy_buffer.h
LazyBuffer & operator= (const LazyBuffer & )Defined at line 35 of file ../../src/storage/minfs/lazy_buffer.h
size_t size ()Returns the size of the buffer in bytes.
Defined at line 38 of file ../../src/storage/minfs/lazy_buffer.h
ResizeableBufferType & buffer ()Defined at line 40 of file ../../src/storage/minfs/lazy_buffer.h
zx::result<> Flush (PendingWork * transaction, MapperInterface * mapper, BaseBufferView * view, const Writer & writer)Iterates through all the blocks in the view, maps from file offset to device offset using
|mapper| and then calls |writer| to actually write the data to the backing store.
Defined at line 40 of file ../../src/storage/minfs/lazy_buffer.cc
zx::result<> Flush (PendingWork * transaction, MapperInterface * mapper, BaseBufferView * view, const Writer & writer)Iterates through all the blocks in the view, maps from file offset to device offset using
|mapper| and then calls |writer| to actually write the data to the backing store.
Defined at line 40 of file ../../src/storage/minfs/lazy_buffer.cc
zx::result<> Detach (Bcache * bcache)Users must call Detach before destruction.
Defined at line 43 of file ../../src/storage/minfs/lazy_buffer.h
zx::result<> Grow (size_t block_count)Defined at line 45 of file ../../src/storage/minfs/lazy_buffer.h
template <typename T>zx::result<BufferView<T>> GetView (size_t index, size_t count, Reader * reader, BaseBufferView::Flusher flusher)Returns a read/write view for the given range. |flusher| will be called by the view if
modified. Implementations should call the Flush method above to flush the buffer, which
will do the mappings for you. For example:
BufferView
<uint64
_t> view;
status = buffer->GetView(
offset, count,
&reader
,
[buffer, transaction](BaseBufferView* view) {
Mapper mapper;
return buffer->Flush(transaction,
&mapper
, view, writer);
},
&view
);
Defined at line 68 of file ../../src/storage/minfs/lazy_buffer.h
template <typename T>zx::result<BufferView<T>> GetView (size_t index, size_t count, Reader * reader)Returns a read only view for the given range.
Defined at line 80 of file ../../src/storage/minfs/lazy_buffer.h